io/router: don't clear event queue before cancel events

There may be unrelated events in the queue, so it's not appropriate
to clear the queue just because an input Cancel event occurs.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

io/router/key.go

@@ -116,7 +116,7 @@ loop:
 				h = new(keyHandler)
 				q.handlers[op.Tag] = h
 				// Reset the handler on (each) first appearance.
-				events.Set(op.Tag, []event.Event{key.FocusEvent{Focus: false}})
+				events.Add(op.Tag, key.FocusEvent{Focus: false})
 			}
 			h.active = true
 		case opconst.TypeHideInput:

io/router/pointer.go

@@ -104,7 +104,7 @@ func (q *pointerQueue) collectHandlers(r *ops.Reader, events *handlerEvents, t o
 			if !ok {
 				h = new(pointerHandler)
 				q.handlers[op.Tag] = h
-				events.Set(op.Tag, []event.Event{pointer.Event{Type: pointer.Cancel}})
+				events.Add(op.Tag, pointer.Event{Type: pointer.Cancel})
 			}
 			h.active = true
 			h.area = area

io/router/router.go

@@ -137,12 +137,6 @@ func (h *handlerEvents) init() {
 	}
 }
 
-func (h *handlerEvents) Set(k event.Tag, evts []event.Event) {
-	h.init()
-	h.handlers[k] = evts
-	h.hadEvents = true
-}
-
 func (h *handlerEvents) Add(k event.Tag, e event.Event) {
 	h.init()
 	h.handlers[k] = append(h.handlers[k], e)